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