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