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