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