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