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