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)(25,26)(27,32)(28,34)(29,37)(30,31)(33,38)(35,36)(39,40) involution — undirected(2,5)(6,7)(10,14)(15,17)(16,20)(23,24)(25,26)(27,32)(28,34)(29,37)(30,31)(33,38)(35,36)(39,40) involution — undirected(1,2)(3,6)(4,5)(7,8)(11,18)(15,17)(19,21)(23,24)(26,31)(27,34)(33,37)(35,40) involution — undirected(1,3)(2,6)(4,8)(5,7)(9,11)(10,15)(12,21)(13,18)(14,17)(16,24)(19,22)(20,23)(25,27,30,34)(26,32,31,28)(29,35,38,40)(33,39,37,36)(9,12)(10,16)(11,19)(13,22)(14,20)(15,23)(17,24)(18,21)(25,28,30,32)(26,27,31,34)(29,36,38,39)(33,35,37,40)(9,10)(11,15)(12,16)(13,14)(17,18)(19,23)(20,22)(21,24)(25,29)(26,33)(27,35)(28,36)(30,38)(31,37)(32,39)(34,40) 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.