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