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