One vertex per element, one color per generator, with an edge from x to x·s.
(2,3)(5,6,9,14,11,17,31,16)(7,18,20,38,23,37,22,12)(8,24,26,59,29,60,28,45)(10,32,30,15,34,44,62,46)(13,39,41,27,43,33,42,63)(19,49,50,65,52,58,25,61)(21,54,53,67,57,36,56,48)(35,51,40,68,66,64,47,55)(1,2)(3,4)(5,7)(6,12)(8,25)(9,22)(10,21)(11,23)(13,40)(14,37)(15,36)(16,18)(17,38)(19,28)(20,31)(24,58)(26,52)(27,55)(29,50)(30,56)(32,48)(33,64)(34,57)(35,41)(39,51)(42,66)(43,47)(44,67)(45,61)(46,54)(49,60)(53,62)(59,65)(63,68) involution — undirected(1,3,4,2)(5,8,11,29)(6,13)(7,19)(9,28,31,26)(10,33,34,39)(12,35,38,66)(14,42)(15,45)(16,41)(17,43)(18,47,37,40)(20,25)(21,55)(22,50)(23,52)(24,32)(27,62,63,30)(36,58,54,49)(44,60)(46,59)(48,65,67,61)(51,56)(53,64)(57,68)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.