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