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