Jim Harbaugh does a lot of stuff most college football coaches wouldn't do, but this might not qualify as that. If you had the chance to drive a top-end sports car on some artificial football turf at your place of work, you'd probably do the same thing, so it's hard to fault Harbaugh for whatever is going on here:
According to ESPN's Tom VanHaaren, the picture came from the (locked) Twitter account of Jackson Carman, a blue-chip offensive tackle being recruited by both Ohio State and Michigan. This appears to be Michigan's practice facility ahead of the Wolverines' spring game.
That's about all we know about this photo at this time.