There are 2 sets of maps floating around the net. I've blatantly stolen both versions for your viewing pleasure. The set on the right has a much nicer look, but is less complete (and less accurate) than the set on the left.

Note: Mapping the levels out on your own is the way to go. It's way less fun if you just use the maps provided here: You won't get to discover stuff on your own. No surprises.

Info on the Levels:

The Wizardry "Proving Grounds" Levels are all confined to a 20x20 grid numbered from 0-19.  If your party travels past the edge of the map they will get wrapped around to the other side of the map. So if your party is at (10 North, 19 East) and move 1 space in the Eastern direction, they will then be at (10 North, 0 East). The guys who designed the levels used this feature to make some of the levels very confusing (Check out the map of level 3).

Tip: Cast "Dumapic" while in camp to find your location in the Maze. 