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