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