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