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