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