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