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)(11,15)(12,14)(13,16)(19,26)(23,31)(27,32)(28,29) involution — undirected(9,11)(10,13)(12,16)(14,15)(17,18,21,25)(19,27,26,32)(20,24,22,30)(23,29,31,28)(2,6)(7,8)(10,14)(11,16)(17,19,22,28,21,26,20,29)(18,23,24,27,25,31,30,32)(1,3,5,4)(2,7,6,8)(10,14)(13,15)(17,20,21,22)(18,24,25,30)(19,28,26,29)(23,32,31,27)(1,4,5,3)(2,8,6,7)(17,19,20,29,21,26,22,28)(18,23,30,32,25,31,24,27)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.