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