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