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