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