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