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