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