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