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