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