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