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