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