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