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