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