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