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