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