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