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