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