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