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)(21,25)(22,27)(24,30)(28,32)(29,31) involution — undirected(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(17,19,21,28)(18,22,25,31)(20,29,30,27)(23,26,24,32)(11,15)(13,16)(18,23)(20,30)(22,26)(24,25)(27,29)(31,32) involution — undirected(10,14)(13,16) involution — undirected(1,3,4,7)(2,6,5,8)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.