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