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