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