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