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