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