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