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