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