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