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