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