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