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