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