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