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