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