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