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)(25,26,31,28)(27,33,35,29)(30,36,38,32)(34,37,40,39)(1,3,4,7)(2,5,6,8)(9,10,13,14)(11,15,17,18)(12,16,20,21)(19,22,23,24)(25,27,31,35)(26,29,28,33)(30,34,38,40)(32,37,36,39)(1,2)(3,5)(4,6)(7,8)(10,14)(11,17)(12,20)(22,24)(26,28)(29,33)(30,38)(34,40) involution — undirected(9,11,13,17)(10,15,14,18)(12,19,20,23)(16,22,21,24)(25,28,31,26)(27,33,35,29)(30,36,38,32)(34,39,40,37)(1,3)(2,5)(4,7)(6,8)(9,10)(11,18)(12,16)(13,14)(15,17)(19,24)(20,21)(22,23)(25,29,31,33)(26,27,28,35)(30,37,38,39)(32,34,36,40)(1,2)(3,5)(4,6)(7,8)(9,12)(10,16)(11,19)(13,20)(14,21)(15,22)(17,23)(18,24)(25,30)(26,32)(27,34)(28,36)(29,37)(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.