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)(11,14)(12,16)(13,15)(18,23)(20,24)(26,28)(27,30) involution — undirected(2,6)(7,8)(9,11,13,12)(10,14,15,16)(17,18,21,23)(19,27,29,30)(20,25,24,32)(22,28,31,26)(1,3,5,4)(2,7,6,8)(10,15)(14,16)(17,19,21,29)(18,24,23,20)(22,32,31,25)(26,30,28,27)(9,12,13,11)(10,16,15,14)(17,20,21,24)(18,25,23,32)(19,28,29,26)(22,27,31,30)(1,4,5,3)(2,8,6,7)(18,26)(20,27)(22,31)(23,28)(24,30)(25,32)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.