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