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