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