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