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