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