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