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