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