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