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