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