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