I think I can get you close. It looks like they used the standard cream/red colors as many Trailways operators did. Hard to get a good shot showing exactly what you need...
Safeway 4104 in B/W: http://i.ebayimg.com/t/Photo-1955-Group-of-5-with-Safeway-Trailways-General-Motors-PD-4104-Bus-S-639-/00/s/NDgwWDY0MA==/$(KGrHqR,!i!E-zqLJQUoBP8cyWVlqQ~~60_35.JPG
Another Safeway 4104 in B/W: http://i.ebayimg.com/t/Photo-1955-Group-of-10-with-Safeway-Trailways-General-Motors-PD-4104-Bus-547-/00/s/NDgwWDY0MA==/$(KGrHqR,!pIE-z3DFyu1BP8csRH+pQ~~60_35.JPG
Better sense of the colors - Reading Trailways 4104: http://joycewiggins.tripod.com/photo/887.jpg
Even better: http://cw42.tripod.com/subdirectory/VSL-V230_4104.jpg
Scroll down here to see what the Reading Trailways bus looks like restored today (notice the cream is now white): http://www.billvons.com/bus/buspage50.htm
I would encourage you to contact the Hershey Bus Museum (http://www.busmuseum.org/Bus_Museum/Welcome.html
) if you'd like to match the exact colors - they do have a Golden Eagle on display that is cream/red.