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