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