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