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