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