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