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