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