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