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