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