If you have made a minimal CentoOS installation you can always install Graphical User interface as part of group packages. Let's first list all available package groups on the system:
# yum group list
Loaded plugins: fastestmirror
There is no installed groups file.
Maybe run: yum groups mark convert (see man yum)
Loading mirror speeds from cached hostfile
 * base: centos.mirror.crucial.com.au
 * extras: centos.mirror.crucial.com.au
 * updates: centos.mirror.crucial.com.au
Available environment groups:
   Minimal Install
   Compute Node
   Infrastructure Server
   File and Print Server
   Basic Web Server
   Virtualization Host
   Server with GUI
   GNOME Desktop
   KDE Plasma Workspaces
   Development and Creative Workstation
Available Groups:
   Compatibility Libraries
   Console Internet Tools
   Development Tools
   Graphical Administration Tools
   Legacy UNIX Compatibility
   Scientific Support
   Security Tools
   Smart Card Support
   System Administration Tools
   System Management
Done
From here we can choose any package group we wish to install. In our case we are interested in Server with GUI or GNOME Desktop. The difference between both Server with GUI and GNOME Desktop package groups is that Server with GUI will along GNOME GUI also install some extra server packages. The get more information about each package group run:


# yum groupinfo "Server with GUI"
AND
# yum groupinfo "GNOME Desktop"
Depending on your decision now install you selected package group. Eg.:
# yum groupinstall 'GNOME Desktop'
The above command will install all necessary packages required by Gnome Desktop GUI. Once the installation is finished the last step which remains is to change system target or runlevel from runlevel 3 to runlevel 5. This will ensure that we directly boot to GNOME GUI:
# systemctl enable graphical.target --force
rm '/etc/systemd/system/default.target'
ln -s '/usr/lib/systemd/system/graphical.target' '/etc/systemd/system/default.target'
All ready to reboot our CentoOS system:
# reboot
Your CentOS should now boot to GNOME GUI as default.
Gnome GUI installation on CentOS 7 Linux
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