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