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