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