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