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