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