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