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