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