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