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