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