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