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