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