I have tried to figure out the operational color schemes for several years. Most photos that exist are from the test days at Cape Canaveral and show either the red or a gray scheme. I contact the research section of the USAF museum about this two or three years ago, and even they don't have any photos of operational Snarks at Presque Isle! (They attributed it to SAC's policies at the time and that it was the first operational intercontiental missle). I have located a few photos in some various books that still haven't cleared anything up for me yet:
On page 108 of "Peace was their Profession. Strategic Air Command: A Tribute" by Hill & Campbell (1995, Schiffer Publishing) there is a black and white photo of a Snark in a very dark and flat paint scheme and completely devoid of any markings. The caption doesn't really identify where the photo was taken, but it doesn't appear to be at an air show. The boosters appear to be a white, light gray or silver color and the rear portion of the fuselauge is an even lighter shade of something!!
A postcard I bought on ebay with a Boston printer shows an overall light gray missile with white boosters, a white band just forward of the wing root, and three narrow angled red stripes below the tail fin (turbine warning stripes??) but without any other markings. Not sure where the photo was taken. I'd like to belive it was at Presque Isle, but I have the feeling it was the Cape as well.
I have recently ordered a CD-ROM from the Air Force Missiliers Association that has photos of the Snark, Mace, and other early missile systems. Maybe I'll get lucky and find an operational bird on it!