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