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