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