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)(25,26,31,35)(27,32,28,37)(29,34,30,39)(33,36,40,38)(1,2)(3,7)(4,5)(6,8)(9,11,14,20)(10,15,17,18)(12,19,13,22)(16,23,21,24)(25,27,31,28)(26,32,35,37)(29,38,30,36)(33,39,40,34)(2,5)(6,7)(25,28,31,27)(26,33,35,40)(29,38,30,36)(32,39,37,34)(9,12,14,13)(10,16,17,21)(11,19,20,22)(15,23,18,24)(25,29,31,30)(26,34,35,39)(27,36,28,38)(32,40,37,33)(1,3,4,8)(2,6,5,7)(9,13,14,12)(10,16,17,21)(11,19,20,22)(15,24,18,23)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.