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