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