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