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