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