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