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