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