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