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