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