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