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