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