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