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