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