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