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)(33,34,38,42)(35,43,46,39)(36,40,48,55)(37,49,51,41)(44,57,60,52)(45,53,62,58)(47,56,50,54)(59,63,61,64)(2,8)(5,9)(10,16)(13,14)(18,22)(23,29)(24,27)(30,32)(33,34,38,42)(35,39,46,43)(36,40,48,55)(37,41,51,49)(44,52,60,57)(45,53,62,58)(47,54,50,56)(59,63,61,64)(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)(33,34)(35,43)(36,40)(37,41)(38,42)(39,46)(44,57)(45,58)(47,54)(48,55)(49,51)(50,56)(52,60)(53,62)(59,64)(61,63)(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)(33,35)(34,39)(36,44)(37,45)(38,46)(40,52)(41,53)(42,43)(47,59)(48,60)(49,58)(50,61)(51,62)(54,63)(55,57)(56,64)(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)(33,36,38,48)(34,40,42,55)(35,44,46,60)(37,50,51,47)(39,52,43,57)(41,56,49,54)(45,61,62,59)(53,64,58,63)(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)(33,37)(34,41)(35,45)(36,47)(38,51)(39,53)(40,54)(42,49)(43,58)(44,59)(46,62)(48,50)(52,63)(55,56)(57,64)(60,61)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.