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