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