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