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