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