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