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