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