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