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