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