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