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