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