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