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