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