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