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