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