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