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