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