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)(11,14)(12,16)(13,15)(17,18)(19,23)(20,25)(21,29)(22,27)(24,26)(28,31)(30,32) involution — undirected(2,6)(7,8)(9,11,13,12)(10,14,15,16)(17,19,23,18)(20,27,31,30)(21,29,24,26)(22,25,32,28)(1,3,5,4)(2,7,6,8)(10,15)(14,16)(17,20)(18,25)(19,28)(21,32)(22,24)(23,31)(26,27)(29,30)(9,12,13,11)(10,16,15,14)(17,21)(18,26)(19,29)(22,32)(23,24)(25,28)(1,4,5,3)(2,8,6,7)(17,22,23,32)(18,27,19,30)(20,24,31,21)(25,26,28,29)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.