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