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