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