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