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