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