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