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