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