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