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