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