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