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