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