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