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