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