One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,8,15,9,12,6,13)(3,10,18,29,17,5,26,27)(4,20,24,41,23,47,37,11)(7,31,35,42,36,14,30,46)(16,48,50,38,51,57,49,22)(19,28,32,62,45,34,61,43)(21,54,52,58,56,53,55,39)(25,60,33,40,59,44,63,64)(1,3)(2,10,12,5)(4,21)(6,18)(7,32)(8,26)(9,17)(11,39,41,58)(13,29,15,27)(14,43,31,62)(16,25)(19,35)(20,53,47,54)(22,40,38,64)(23,56)(24,55)(28,46,34,42)(30,45)(33,49)(36,61)(37,52)(44,48,60,57)(50,63)(51,59)(1,4,8,37,9,23,6,24)(2,11,13,20,12,41,15,47)(3,16,26,50,17,51,18,49)(5,22,27,57,10,38,29,48)(7,33,35,25,36,63,30,59)(14,44,42,64,31,60,46,40)(19,52,61,56,45,55,32,21)(28,53,62,58,34,54,43,39)(1,5,9,10)(2,3,12,17)(4,22,23,38)(6,29,8,27)(7,34,36,28)(11,16,41,51)(13,26,15,18)(14,45,31,19)(20,50,47,49)(21,40,56,64)(24,48,37,57)(25,39,59,58)(30,62,35,43)(32,46,61,42)(33,54,63,53)(44,55,60,52)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.