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)(28,29)(30,32)(31,36)(34,35)(37,40)(38,39) 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)(26,31)(28,37)(29,35)(30,36)(32,33)(34,39)(38,40)(1,2)(3,5)(4,6)(7,8)(12,20)(15,21)(18,24)(22,23)(25,26,30,32)(27,31,36,33)(28,38,39,29)(34,35,37,40)(1,3)(2,5)(4,8)(6,7)(9,12)(10,15)(11,18)(13,20)(14,22)(16,23)(17,21)(19,24)(25,28,30,39)(26,29,32,38)(27,34,36,37)(31,40,33,35)(9,11)(10,16)(12,18)(13,19)(14,17)(15,23)(20,24)(21,22)(25,27)(26,31)(28,34)(29,40)(30,36)(32,33)(35,38)(37,39) involution — undirected(9,10)(11,14)(12,21)(13,17)(15,20)(16,19)(18,23)(22,24)(25,29)(26,28)(27,35)(30,38)(31,37)(32,39)(33,34)(36,40) 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.