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