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