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)(11,15)(12,14)(13,16) involution — undirected(9,11)(10,13)(12,16)(14,15)(17,18,22,26)(19,27,20,30)(21,32,28,25)(23,31,24,29)(2,5)(6,8)(10,14)(11,16)(17,19,28,31,22,20,21,29)(18,23,32,30,26,24,25,27)(1,3,4,7)(2,6,5,8)(10,14)(13,15)(19,20)(23,24)(27,30)(29,31)(17,20,28,29,22,19,21,31)(18,24,32,27,26,23,25,30)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.