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