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