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