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