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