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