Okay, I know it's not a Taurus, but these guys asked!
This is a closer picture of the S&W 681 with the Crimson Trace grips. The laser is in the "bump" on the top of the right grip. The on/off switch is recessed in the bottom of the grip, and the momentary switch is right where your middle finger wraps around behind the trigger guard.
This shows the laser in operation.