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