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