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