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