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