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