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