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