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