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