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