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