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