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