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