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