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