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