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