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