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