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