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