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