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