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