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