One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,9,25,6,5,8,13)(3,10,18,35,16,15,30,42)(4,11,31,43,21,20,23,38)(7,12,32,59,26,24,29,41)(14,33,46,61,45,44,50,63)(17,34,27,39,48,47,60,57)(19,36,53,64,52,51,49,62)(22,37,28,40,55,54,56,58)(1,3,8,30,6,16,9,18)(2,10,25,35,5,15,13,42)(4,19,23,49,21,52,31,53)(7,27,29,17,26,60,32,48)(11,36,43,64,20,51,38,62)(12,39,59,47,24,57,41,34)(14,28,50,22,45,56,46,55)(33,58,61,37,44,40,63,54)(1,4,6,21)(2,11,5,20)(3,14,16,45)(7,28,26,56)(8,31,9,23)(10,33,15,44)(12,40,24,58)(13,43,25,38)(17,49,48,53)(18,50,30,46)(19,27,52,60)(22,29,55,32)(34,62,47,64)(35,63,42,61)(36,39,51,57)(37,41,54,59)(1,5,6,2)(3,15,16,10)(4,20,21,11)(7,24,26,12)(8,25,9,13)(14,44,45,33)(17,47,48,34)(18,42,30,35)(19,51,52,36)(22,54,55,37)(23,43,31,38)(27,57,60,39)(28,58,56,40)(29,59,32,41)(46,63,50,61)(49,64,53,62)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.