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)(19,25)(20,24)(21,28)(22,27)(23,29)(26,31)(30,32) involution — undirected(1,3,5,4)(2,6,7,8)(9,10,13,14,12,15,11,16)(17,19,21,20,23,31,22,30)(18,24,27,25,29,32,28,26)(1,4,5,3)(2,6,7,8)(10,14)(11,13)(15,16)(17,20,21,31,23,30,22,19)(18,25,27,32,29,26,28,24)(2,7)(6,8)(10,15)(14,16)(17,20,21,31,23,30,22,19)(18,26,27,24,29,25,28,32)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.