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