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