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