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