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