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