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