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