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