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