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