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