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