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