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