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