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