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