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