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