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