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