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The only time I've seen the guidelines on the reverse camera was on a post here, and I believe the owner was from Germany or something. Outside of theirs, I've never seen it on our cars.
As for the parking sensors, do you have the circular studs on your rear bumper? The front has rectangular. If not, then your car doesn't have the sensors.
You should go to www.lexusdrivers.com and log in for free. Under resources you will find
your Owner's Manual and Navigation Manual. No, 2011 GS's did not have back up camera
guide lines. Does yours have the dime sized sensors on the front and rear bumpers? If so
you need to open the small hinged drawer on the lower left dash and you will find buttons
for the Park Assist. Many other toys to be had as well, be sure to close it or you will whack
a knee against it when exiting the car!