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