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