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