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