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)(11,14)(12,13)(15,16)(19,28)(20,24)(25,30)(29,31) involution — undirected(2,5)(6,8)(17,18)(19,29)(20,25)(21,27)(22,26)(23,32)(24,30)(28,31) involution — undirected(10,13)(14,16)(17,19,22,28)(18,24,26,20)(21,30,23,25)(27,31,32,29)(9,11,12,15)(10,14,13,16)(17,20,22,24)(18,25,26,30)(19,27,28,32)(21,31,23,29)(1,3,4,7)(2,6,5,8)(17,21)(19,30)(22,23)(25,28)(27,32)(29,31)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.