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