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