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