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