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