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