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