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