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