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