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