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