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