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