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)(11,15,16,13)(17,18,20,22)(19,21,23,24)(25,26)(27,32)(28,35)(29,31)(30,37)(33,38)(34,40)(36,39)(1,2)(3,6)(4,5)(7,8)(9,10)(11,13)(12,14)(15,16)(19,23)(21,24)(25,27,31,28)(26,32,29,35)(30,34,38,36)(33,39,37,40)(2,5)(6,7)(9,10)(11,15)(12,14)(13,16)(17,19)(18,21)(20,23)(22,24)(25,28,31,27)(26,32,29,35)(30,36,38,34)(33,39,37,40)(1,3,4,8)(2,6,5,7)(9,10)(11,15)(12,14)(13,16)(17,18)(19,21)(20,22)(23,24)(25,29,31,26)(27,32,28,35)(30,37,38,33)(34,39,36,40)(1,2)(3,7)(4,5)(6,8)(9,11)(10,13)(12,16)(14,15)(25,30)(26,33)(27,34)(28,36)(29,37)(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.