Where can I find system log information on OS X Lion 10.7.5 for System Preferences changes?
You can find that information in the ~/Library/Preferences/com.apple.systempreferences.plist

They will open in TextEdit, but hard to read. So you might need to read this for help with Plist readers.

you can also see the plist changes in the:

Console (by typing pref in the search window)



While the Console is up to the moment reporting it will only report issues not the successful execution.