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