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