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