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