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