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