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