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