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