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