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