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