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