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