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