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