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