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