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