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