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