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