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