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