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