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