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