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