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