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