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