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