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