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