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