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