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