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