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