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