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