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