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)(17,18,22,23)(19,24,21,20)(25,26)(27,30)(28,33)(29,34)(31,35)(32,38)(36,39)(37,40)(9,11,14,12)(10,15,13,16)(17,19,22,21)(18,20,23,24)(26,27)(28,35)(32,34)(36,37)(17,20)(18,19)(21,23)(22,24)(25,27,30,26)(28,33,35,31)(29,34,38,32)(36,40,37,39)(1,2)(3,6)(4,5)(7,8)(9,12,14,11)(10,15,13,16)(17,21,22,19)(18,20,23,24)(25,28)(26,31)(27,33)(29,37)(30,35)(32,40)(34,39)(36,38)(1,3,4,7)(2,6,5,8)(9,13,14,10)(11,16,12,15)(17,20)(18,21)(19,23)(22,24)(25,29)(26,32)(27,34)(28,36)(30,38)(31,39)(33,40)(35,37)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.