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