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