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