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