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