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