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