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