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