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