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