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