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