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