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