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