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