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