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