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