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)(19,27)(20,30)(21,25)(22,26)(23,24)(28,32)(29,31) involution — undirected(2,5)(3,7)(10,13)(11,15)(17,19,22,23)(18,24,26,27)(20,25,31,28)(21,30,32,29)(9,10,12,13)(11,14,15,16)(17,20,23,25,22,31,19,28)(18,21,27,30,26,32,24,29)(1,3,4,7)(2,6,5,8)(10,13)(14,16)(17,21,22,32)(18,25,26,28)(19,29,23,30)(20,27,31,24)(9,11,12,15)(10,14,13,16)(18,26)(21,32)(24,27)(29,30)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.