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