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