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