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