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