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