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