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