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