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