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