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