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