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