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