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