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