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