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