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