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