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