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)(11,12,17,22)(13,18,24,32)(14,27,29,36)(15,21,16,20)(19,30,35,28)(23,37,38,42)(25,34,26,33)(31,40,41,39)(4,7)(8,10)(11,13,17,24)(12,18,22,32)(14,23,29,38)(15,25,16,26)(19,31,35,41)(20,33,21,34)(27,37,36,42)(28,39,30,40)(11,14)(12,19)(13,23)(15,28)(16,30)(17,29)(18,31)(20,27)(21,36)(22,35)(24,38)(25,39)(26,40)(32,41)(33,37)(34,42) involution — undirected(3,5,6,9)(4,8,7,10)(13,24)(18,32)(23,38)(25,26)(31,41)(33,34)(37,42)(39,40)(11,15,17,16)(12,20,22,21)(13,25,24,26)(14,28,29,30)(18,33,32,34)(19,27,35,36)(23,39,38,40)(31,37,41,42)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.