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