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