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