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