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