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