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