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