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