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