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