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