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