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