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