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