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)(40,46)(42,44)(45,60)(47,59)(48,54)(49,64)(50,58)(51,57)(53,61)(55,63)(56,62)(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)(36,48)(40,53)(42,52)(43,59)(45,49)(50,51)(62,63)(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)(33,35,44,61,38,47,37,46)(34,40,52,59,39,53,42,43)(36,49,50,63,48,45,51,62)(41,56,57,60,54,55,58,64)(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)(35,45)(37,51)(38,48)(39,54)(40,55)(42,58)(43,60)(44,50)(46,63)(47,49)(52,57)(53,56)(59,64)(61,62)(1,5,6,4)(2,8,9,14)(3,12,13,11)(7,15,10,16)(19,26)(22,30)(25,27)(29,31)(33,37,38,44)(34,42,39,52)(35,46,47,61)(36,50,48,51)(40,43,53,59)(41,57,54,58)(45,62,49,63)(55,64,56,60)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.