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