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