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