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