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