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