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