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