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