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