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