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