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