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