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