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