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