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