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