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