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