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