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