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