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