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