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