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