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