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