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