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