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