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