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