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)(11,16)(12,21)(13,23)(14,18)(15,20)(17,22)(19,24)(25,26,28,30)(27,33,35,31)(29,32,36,38)(34,39,37,40)(1,3,4,8)(2,5,6,7)(9,11,13,20,14,19,22,12)(10,15,17,16,18,21,23,24)(26,30)(27,34)(29,36)(31,39)(33,40)(35,37)(2,6)(5,7)(11,19)(12,20)(15,21)(16,24)(25,27,28,35)(26,31,30,33)(29,37,36,34)(32,39,38,40)(2,6)(5,7)(9,12,22,19,14,20,13,11)(10,16,23,15,18,24,17,21)(26,30)(31,33)(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.