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