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