One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,6)(3,5,7,8)(9,10)(11,17)(12,13)(14,22)(15,16)(18,23)(19,21)(20,24)(25,26,31,35)(27,32,36,38)(28,30,34,39)(29,33,37,40)(3,7)(5,8)(9,11,15,12)(10,13,16,17)(14,19,23,20)(18,21,22,24)(25,27,31,36)(26,32,35,38)(28,29,34,37)(30,33,39,40)(1,2)(3,5)(4,6)(7,8)(10,16)(13,17)(18,22)(21,24)(27,36)(29,37)(32,38)(33,40) involution — undirected(9,12,15,11)(10,17,16,13)(14,19,23,20)(18,21,22,24)(25,28)(26,30)(27,29)(31,34)(32,33)(35,39)(36,37)(38,40)(1,3)(2,5)(4,7)(6,8)(9,13,15,17)(10,12,16,11)(14,21,23,24)(18,20,22,19)(25,29)(26,33)(27,34)(28,36)(30,38)(31,37)(32,39)(35,40)(1,2)(3,5)(4,6)(7,8)(9,14)(10,18)(11,19)(12,20)(13,21)(15,23)(16,22)(17,24)(25,30)(26,34)(27,33)(28,35)(29,38)(31,39)(32,37)(36,40) 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.