I haven't seen any FW boat with painted on graphics. All that I've seen are vinyl. The color is either gelcoat of vinyl. You might be able to help them out by finding the part numbers for the graphics on the FW website and providing them with the info.
As to the sandstone color...I had a canvas shop fix a couple of small holes that I believe were caused by the flapping of the bimini tops in their covers at highway speeds. They matched the color perfect. I seriously doubt that Sunbrella makes custom colors for FW. Great Lakes is the outside vendor that makes the all the canvas items for FW.
http://www.greatlakesboattop.com/fourwinns
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Jvalich
http://www.badcock.com'04 FW 288 Vista "Mental Floss"