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