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