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