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