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)(19,27)(20,24)(21,25)(22,32)(23,26)(28,30)(29,31) involution — undirected(9,11)(10,13)(12,15)(14,16)(17,19,22,25,23,28,20,29)(18,21,24,27,26,31,32,30)(1,3,5,4)(2,6,7,8)(11,15)(13,16)(17,20,23,22)(18,24,26,32)(19,25,28,29)(21,30,31,27)(11,15)(13,16)(17,21,23,31)(18,25,26,29)(19,24,28,32)(20,30,22,27)(1,4,5,3)(2,6,7,8)(10,14)(13,16)(18,26)(21,31)(24,32)(27,30)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.