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