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