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