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