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