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