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