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