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