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