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