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