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