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