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