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