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