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