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