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