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