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