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