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