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