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