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