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