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