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