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