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