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