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