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