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