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