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