It should have installed the exact theme from the LiveCD user unless you told the installer NOT to format your /home partition, thereby keeping all of your settings from your last install intact.
But to answer your question:
The easy way is to reboot with the LiveCD and copy everything from the /home/sabayonuser/.kde/ directory over to your own installed ~/.kde/ directory. NOTE: Keep in mind that ALL of your settings, konqueror bookmarks, Kmail settings, everything that pertains to KDE will be gone and reset to the LiveCD user's sttings. But you will end up with the "gorgeous" theme that you desire.
The other, more difficult, way is to get a screenshot of the LiveCD desktop and play with the KDE settings on your own and come up with the look you want. This option is probably safer if you already have settings and files that you want to keep.