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