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