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