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