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