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