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