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