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