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