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