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)(11,17,18,14)(12,16,20,22)(19,23,24,21)(27,33)(28,35)(30,36)(32,38)(34,39)(37,40)(1,3,5,4)(2,6,8,7)(9,11,13,18)(10,14,15,17)(12,19,20,24)(16,21,22,23)(25,26,29,31)(27,30,34,37)(28,32,35,38)(33,36,39,40)(1,3,5,4)(2,7,8,6)(10,15)(11,18)(16,22)(19,24)(25,27,28,33,29,34,35,39)(26,30,32,36,31,37,38,40)(1,4,5,3)(2,6,8,7)(12,20)(16,22)(19,24)(21,23)(9,12,13,20)(10,16,15,22)(11,19,18,24)(14,21,17,23)(26,31)(30,37)(32,38)(36,40)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.