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