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