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