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