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