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