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