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