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