One vertex per element, one color per generator, with an edge from x to x·s.
(1,2) involution — undirected(3,4)(5,8)(6,7)(9,10)(11,12,16,20)(13,17,22,30)(14,24,27,39)(15,28,25,19)(18,32,33,26)(21,34,36,42)(23,38,35,31)(29,40,41,37)(4,7)(8,10)(11,13)(12,17)(14,21)(15,23)(16,22)(18,29)(19,31)(20,30)(24,34)(25,35)(26,37)(27,36)(28,38)(32,40)(33,41)(39,42) involution — undirected(11,14,25,32,16,27,15,26)(12,18,28,39,20,33,19,24)(13,21,35,40,22,36,23,37)(17,29,38,42,30,41,31,34)(3,5,6,9)(4,8,7,10)(11,13)(12,17)(14,21)(15,23)(16,22)(18,29)(19,31)(20,30)(24,34)(25,35)(26,37)(27,36)(28,38)(32,40)(33,41)(39,42)(13,22)(17,30)(21,36)(23,35)(29,41)(31,38)(34,42)(37,40) 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.