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