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