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