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