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