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