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