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