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