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