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