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