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