Did you find this one? I though it was OKish.
http://www.historic66.com/description/map.html
Virtually all the original route in the east is lost to more modern roads. Obviously you can break off the modern route to go through the old towns but the most satisfying parts are in the west - to the west of Alberqueque.
The modern route equivalent from here is now the I-40. There is a section of original R66 between Flagstaff and Kingman that runs parallel to the I-40 and is the real business.