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