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