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