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