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