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