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