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)(14,16)(17,18)(19,27)(20,23)(21,30)(22,26)(24,28)(25,31)(29,32) involution — undirected(2,5)(6,7)(10,14)(12,15)(13,16)(17,19,21,20,22,28,31,29)(18,23,25,27,26,32,30,24)(9,10,11,13)(12,16,15,14)(17,19,21,20,22,28,31,29)(18,23,25,27,26,32,30,24)(1,3,4,8)(2,6,5,7)(10,13)(14,16)(17,20,21,28,22,29,31,19)(18,24,25,23,26,27,30,32)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.