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