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)(11,14)(12,15)(13,17)(16,20)(18,22)(19,21)(23,24)(25,26)(27,35)(28,33)(29,31)(30,34)(32,37)(36,39)(38,40) involution — undirected(2,5)(6,8)(9,11)(10,14)(12,19)(13,18)(15,21)(16,23)(17,22)(20,24)(26,31)(27,36)(28,30)(32,35)(37,38)(39,40) involution — undirected(10,15)(12,20)(14,21)(16,17)(19,24)(22,23)(25,27,29,38)(26,32,31,39)(28,36,30,37)(33,35,34,40)(1,3,4,7)(2,6,5,8)(11,18)(14,22)(19,24)(21,23)(25,28,29,30)(26,33,31,34)(27,37,38,36)(32,40,39,35)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.