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