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