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