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