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)(17,18,21,25,23,26,22,32)(19,20,27,29,28,30,31,24)(1,3,12,14,6,13,5,4)(2,7,15,8,10,16,9,11)(17,19,23,28)(18,24,26,29)(20,25,30,32)(21,31,22,27)(1,4,5,13,6,14,12,3)(2,8,9,7,10,11,15,16)(17,20,22,24,23,30,21,29)(18,19,25,27,26,28,32,31)(3,13)(4,14)(7,16)(8,11) 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.