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