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