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)(19,25)(20,28)(21,26)(22,31)(23,27)(24,29)(30,32) involution — undirected(1,2,7,13,5,9,4,6)(3,8,14,16,10,15,11,12)(17,19,21,20,23,30,22,29)(18,24,31,32,27,28,26,25)(17,20,22,19,23,29,21,30)(18,25,26,28,27,32,31,24)(1,3)(2,8)(4,11)(5,10)(6,12)(7,14)(9,15)(13,16)(17,18)(19,28)(20,25)(21,31)(22,26)(23,27)(24,30)(29,32) involution — undirected(3,10)(8,15)(11,14)(12,16)(17,21,23,22)(18,26,27,31)(19,20,30,29)(24,25,28,32)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.