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