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