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