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