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