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)(17,18,20,22)(19,25,26,32)(21,29,28,24)(23,31,30,27)(1,3,4,8)(2,5,6,7)(9,11)(10,13)(12,16)(14,15)(18,22)(23,30)(24,29)(25,32)(11,16)(13,14)(17,19,21,27,20,26,28,31)(18,23,24,25,22,30,29,32)(9,11)(10,14)(12,16)(13,15)(19,26)(23,30)(25,32)(27,31) involution — undirected(11,16)(13,14) involution — undirectedA 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.