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