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