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