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